let obj={
    name:"alice",
    age:20
};
let calcCount=function(arr=[]){
    let count=0;
    for(var i=0;i<arr.length;i++){
        if(typeof arr[i]=="number"){
            count++;
        }
    }
    return count;
};

let arrToStr=function(arr=[]){
    return arr.join("*");
};

module.exports={
    obj:obj,
    calcCount:calcCount,
    arrToStr:arrToStr
};